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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_GLYPH_DATA_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_GLYPH_DATA_H_
#include "base/containers/span.h"
#include "third_party/blink/renderer/platform/geometry/layout_unit.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/assertions.h"
#include "ui/gfx/geometry/vector2d_f.h"
namespace blink {
enum class SafeToBreak : uint8_t { kSafe = 0, kUnsafe = 1 };
inline bool IsSafeToBreak(SafeToBreak value) {
return value == SafeToBreak::kSafe;
}
// Because glyph offsets are often zero, particularly for Latin runs, we hold it
// in |ShapeResultRun::GlyphDataCollection::offsets_| for reducing memory
// usage.
struct HarfBuzzRunGlyphData {
DISALLOW_NEW();
// The max number of characters in a |RunInfo| is limited by
// |character_index|.
static constexpr unsigned kCharacterIndexBits = 15;
static constexpr unsigned kMaxCharacters = 1 << kCharacterIndexBits;
static constexpr unsigned kMaxCharacterIndex = kMaxCharacters - 1;
// The max number of glyphs in a |RunInfo|. This make the number
// of glyphs predictable and minimizes the buffer reallocations.
static constexpr unsigned kMaxGlyphs = kMaxCharacters;
HarfBuzzRunGlyphData() = default;
HarfBuzzRunGlyphData(unsigned glyph,
unsigned character_index,
SafeToBreak safe_to_break_before,
TextRunLayoutUnit advance)
: glyph(glyph),
character_index(character_index),
unsafe_to_break_before(static_cast<bool>(safe_to_break_before)),
advance(advance) {}
SafeToBreak SafeToBreakBefore() const {
return static_cast<SafeToBreak>(unsafe_to_break_before);
}
bool IsSafeToBreakBefore() const {
return blink::IsSafeToBreak(SafeToBreakBefore());
}
void SetSafeToBreakBefore(SafeToBreak value) {
unsafe_to_break_before = static_cast<bool>(value);
}
void SetAdvance(TextRunLayoutUnit value) { advance = value; }
void AddAdvance(TextRunLayoutUnit value) { advance += value; }
void SetAdvance(float value) {
advance = TextRunLayoutUnit::FromFloatRound(value);
}
void AddAdvance(float value) {
advance += TextRunLayoutUnit::FromFloatRound(value);
}
unsigned glyph : 16;
// The index of the character this glyph is for. To use as an index of
// |String|, it is the index of UTF16 code unit, and it is always at the
// HarfBuzz cluster boundary.
unsigned character_index : kCharacterIndexBits;
unsigned unsafe_to_break_before : 1;
TextRunLayoutUnit advance;
};
static_assert(std::is_trivially_copyable<HarfBuzzRunGlyphData>::value, "");
using GlyphOffset = gfx::Vector2dF;
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_GLYPH_DATA_H_
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